Barometric pressure and temperature sensor polling example

Browse source code on GitHub

Overview

This sample application periodically reads the sensor temperature and pressure, displaying the values on the console along with a timestamp since startup. It also displays the estimated altitude if floating point is supported.

Wiring

This sample uses an external breakout for the sensor. A devicetree overlay must be provided to identify the I2C/SPI used to control the sensor.

Building and Running

This sample supports pressure sensor devices. Device needs to be aliased as pressure-sensor. For example:

/ {
        aliases {
                pressure-sensor = &icp201xx;
        };
};

Make sure the aliases are in devicetree, then build and run with:

# From the root of the zephyr repository
west build -b nrf52dk/nrf52832 samples/sensor/pressure_polling
west flash

Sample Output

## Default configuration

Found device “icp101xx@63”, getting sensor data [00:00:00.266,479] <inf> PRESSURE_POLLING: Starting pressure and altitude polling sample. [00:00:00.273,803] <inf> PRESSURE_POLLING: temp 25.49 Cel, pressure 96.271438 kPa, altitude 447.208465 m [00:00:00.280,914] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.271331 kPa, altitude 447.234161 m [00:00:00.288,024] <inf> PRESSURE_POLLING: temp 25.49 Cel, pressure 96.266685 kPa, altitude 447.636077 m [00:00:00.295,135] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.267951 kPa, altitude 447.537078 m [00:00:00.302,246] <inf> PRESSURE_POLLING: temp 25.51 Cel, pressure 96.268577 kPa, altitude 447.488281 m [00:00:00.309,356] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.269340 kPa, altitude 447.414978 m [00:00:00.316,467] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.268562 kPa, altitude 447.473663 m [00:00:00.323,547] <inf> PRESSURE_POLLING: temp 25.50 Cel, pressure 96.267341 kPa, altitude 447.596496 m

<repeats endlessly>

See also

Sensor Interface